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I have looked around different forums and couldn't seem to find someone else with my problem so here is my situation.

I have had different phases of wanting to study for the GMAT and have bought different books in different phases.The result? I currently have the following books that I have no idea whether if it is helpful for the current exam.

OG 11th editionMGMAT 4th edition (all 8 of 'em)

So here is my problem: from what I've looked around, I don't think studying with the above books (using the conversion table for the 11th/12th edition for the MGMAT books) will be a huge problem in terms of preparing me for the exam. However, is it worth it to buy the OG 13th edition now that I am two editions behind on the OG?

Will it be better to study with the OG13 and MGMAT 4th edition instead of the OG11 and MGMAT 4th edition?

I will get the OG13 and use the OG11 for additional practice then. I assume if around 1/3 of the content changes each edition, that should give me quite a few "new" questions to practice with the OG11?